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Re^2: Performance Trap - Opening/Closing Files Inside a Loop

by tachyon (Chancellor)
on Dec 10, 2004 at 08:30 UTC ( #413781=note: print w/replies, xml ) Need Help??


in reply to Re: Performance Trap - Opening/Closing Files Inside a Loop
in thread Performance Trap - Opening/Closing Files Inside a Loop

We found that ext3 with the 2.4.x Linux Kernel was reasonably happy with 10,000 files in a directory but obviously unhappy with 1 million. By reasonably happy I mean other bottlenecks dominated affairs. I would be interested if anyone has done a study on the relation of file numbers per dir vs access time for different file systems that it a little more precise.

cheers

tachyon

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Re^3: Performance Trap - Opening/Closing Files Inside a Loop
by meredith (Friar) on Dec 10, 2004 at 21:31 UTC

    Out of curiousity, did you test with the 'dir_index' feature flag set? It allows the filesystem to use hashed b-trees for lookups in large directories.

    mhoward - at - hattmoward.org

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[Lady_Aleena]: I don't hate it, it just drives me crazy.
[Discipulus]: LA the solution is portable to whatever
[Lady_Aleena]: File::Find doesn't have a simple sub wanted example, like get the name of the file.
[Discipulus]: there is also find2perl with your perl installation
[Discipulus]: and in the wanted sub you just calculate the duretion and add it the total, stop
[shmem]: sub wanted { push @files, $File::Find::name if $File::Find::name =~/\.mp3$/ }

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